EP2549486B1

EP2549486B1 - Preparation method for silver matrix electrical contact material enhanced by grains with oriented arrangement

Info

Publication number: EP2549486B1
Application number: EP11846153.2A
Authority: EP
Inventors: Lesheng Chen; Xiao Chen; Chengfa Mu; Gengxin Qi
Original assignee: Wenzhou Hongfeng Electrical Alloy Co Ltd
Current assignee: Wenzhou Hongfeng Electrical Alloy Co Ltd
Priority date: 2010-12-09
Filing date: 2011-04-11
Publication date: 2018-10-31
Anticipated expiration: 2031-04-11
Also published as: CN102074278B; WO2012075667A1; US9437998B2; CN102074278A; US20130277894A1; EP2549486A1; EP2549486A4

Description

Background of the Present Invention

Field of Invention

The present invention relates to a preparation method of the electrical contact material in material technology field, and more particularly to a preparation method of the particle directional arrangement reinforced silver based electrical contact material.

Description of Related Arts

With the development of modern industry, the requirements to the performance of the silver-based electrical contact materials are higher and higher, the traditional silver-based contact materials gradually expose the shortcomings in electrical properties, mechanical properties and so on. As a result, the new silver matrix composites are developed constantly. In recent years, due to excellent electrical and physicochemical properties, particle reinforcing silver-based contact materials are widely researched and applied. The reinforcement of the particle reinforcing silver-based material has low cost, uniform microstructure, and simple preparation process, and can be processed by the traditional metal processing technology. Therefore, particle reinforcing silver-based materials have good development prospects.
After retrieval, the research reports on the particle reinforced silver-based electrical contact materials at home and abroad are described as follows.

1) Chinese invention patent: a preparation method of carbon coating nickel nano-particle reinforced silver-based composite material, Application No. 200810153154.9 , Publication No. CN101403105A
2) Chinese invention patent: a preparation method of tin oxide reinforced silver-based electrical contact material, Application No. 200910196280.7 , Publication No. CN101707155A
3) Chinese invention patent: a preparation method of metal matrix composites, application number: 200410064970.4 , publication number: CN1760399A
4) Chinese invention patent: a preparation method of particle reinforcing metal matrix composites, application number: 200810018200.4 , publication number: CN101285187A .
5) US 2001/0051102 A1 disclosing Method for producing composite powders based on silver-tin oxide, the composite powders so produced, and the use of such powders to produce electrical contact materials by powder metallurgy techniques.
6) CN 101608272 disclosing an AgNi-base electrical contact material and a preparation method thereof.

At present, there are two preparation methods of particle reinforcing silver-based electrical contact material. The first method is the traditional powder metallurgical sintering method, that is to say, the reinforcing particles and the matrix metal powders are evenly mixed, an then coldly molded, and then hot-pressed and kept pressure after vacuum degassing, and the hot-pressed and molded body can be extruded, rolled and forged for further processing. While mixing the powders, the particles of the reinforcing phase are easily gathered, the reinforcing phase is unevenly distributed, thereby affecting the performance of the product. The second method is based on the traditional method to pre-process the particles of the reinforcing phase [literature 1], the particles of the reinforcing phase-the matrix [literatures 2 and 3], or the matrix [4] by special technologies. For the second method, by pre-processing the particles, the particles of the reinforcing phase can be dispersedly distributed in the silver matrix. However, researches show that when the particles of the dispersedly distributed reinforcing phase is smaller (nano-level), the electronic scattering effect will enhanced greatly, the resistance of the contact material is increased significantly, thereby seriously affecting the performance of the product.

Summary of the Present Invention

For the shortcomings and defects of the prior art, the present invention provides a method of preparing a reinforcing silver-based electrical contact material with directionally arranged particles, which can obtain the particle-reinforcing silver-based material with excellent electrical performance in spite of large or small particles of the reinforcing phase. The process is simple, easy to operate, and places no special requirements on the equipment. Furthermore, the welding resistance, the arc erosion resistance performance and the conductivity of the material prepared by the present invention are greatly improved, and the processing performance is excellent.
To accomplish the above object, the technical solution adopted by the present invention is described as follows.
The present invention provides the method of preparing a silver-based electrical contract material with directionally arranged reinforcing particles defined by claim 1.
For the reinforcing silver-based electrical contract material with directionally arranged particles prepared by the present invention, the reinforcing phase exists in the matrix in a form of particles being connected with each other and directionally arranging, an average size of the particles of the reinforcing phase powders is 5nm-30µm, and the reinforcing phase is a material or a mixture of a variety of materials.
Different from the traditional preparation method combining chemical plating coating with powder metallurgy (namely, preparing the composite powders by chemical plating coating → mixing the composite powders with the matrix powders (or composite powders) → cold-pressing → sintering → repressing → extruding), the preparation method of the present invention has significant differences as follows. In the present invention, the coated body in which Ag coats the reinforcing phase particles is prepared by chemical plating coating, and then the aggregated body of the coated body is obtained by granulating, and then the aggregated body and the matrix Ag powders are evenly mixed according to a required amount of the material composition formula, and then cold-isostatically pressed, sintered, hot-pressed and hot-extruded. During the extrusion process, the coated body flows together with the softened Ag in the Ag matrix, due to the coating of Ag, the particles of the reinforcing phase are easily open, and directionally arranged along the extrusion direction for similarly forming the fibrous structure. For the material prepared by the method, the reinforcing phase exists in the form of the particles being connected with each other and directionally arranged, similar to the fibrous structure. The arc erosion resistance performance of the material prepared by the method is increased by 10-20% than the contact material of the pure particles dispersed reinforcing same material system, conductivity along the extrusion direction is increased by 5-15%, welding resistance performance is increased by 10-20% and electrical life is increased by 10-30%. Furthermore, it has excellent processing performance for large-scale production.

Brief Description of the Drawings

The drawing is the metallograph of the reinforcing AgSnO₂(10) electrical contact material with directionally arranged particles prepared by the first embodiment of this invention.

Detailed Description of the Preferred Embodiment

The following is a further description of the technical solution of the present invention. The following instructions are only to clarify the technical solution of the present invention, not to limit the scope of the invention, and the scope of protection of the present invention is subject to claims.
The preparation method of the above-mentioned silver-based electrical contact material with directionally arranged reinforcing particles of the present invention is adapted for the usual particle-reinforcing silver-based composites. In spite of large or small particles of the reinforcing phase, it can obtain the particle-reinforcing silver-based material with excellent electrical performance. The process is simple, easy to operate, and places no special requirements on the equipment. Furthermore, the welding resistance, the arc erosion resistance performance and the conductivity of the material prepared by the present invention are greatly improved, and the processing performance is excellent.
For the silver-based electrical contact material prepared by the present invention, the reinforcing phase exists in the matrix in the form of the particles being connected with each other and directional arrangement. The average size of the powder particles of the reinforced phase material is 5nm-30µm. The reinforcing phase material is a material or a mixture of a variety of materials. While preparing, the reinforcing phase is determined according to the content of the material what is needed.
In the steps, such as chemical plating coating, granulating, mixing powder, cold isostatic pressing, sintering, hot-pressing and heat-extruding, of the present invention, the parameters of the concrete technology operation can be chosen as follows.
In the 1^st step, the reinforcing phase powder are dissolved in the hydrazine hydrate solution, and then the mixed solution is added into the AgNO₃ aqueous solution, for stirring, and simultaneously ammonia is added for adjusting PH value. After the reaction, the sediment is filtered out, and then washed and dried in turn, thereby obtaining the composite powder with Ag coating the reinforcing particles. The following parameters can be used. The weight ratio of the reinforcing phase powder to AgNO₃ is between 1/4 and 10/3, the weight ratio of hydrazine hydrate to AgNO₃ is between 2/3 and 1/3, the stirring speed is between 80rev/min and 120 rev/min, the pH value is between 8 and 11, the reaction time is between 3 hours and 10 hours, the drying temperature is between 40°C and 100°C, and the drying time is between 3 hours and 10 hours.
In the 2^nd step, the composite powders obtained from the 1st step are sintered and granulated. The parameters can be used as below. The sintering temperature is between 400°C and 800°C and the sintering time is between 2 hours and 6 hours.
In the 3^rd step, the composite powders obtained from the 2^nd step and silver powders are mixed in the powder mixer. The weight ratio of the composite powder and the matrix silver powder is calculated according to the amount of the starting materials. The parameters can be used as below. The speed of the powder mixer is between 20 rev/min and 30 rev/min, and the mixing time is between 2 hours and 4 hours.
In the 4^th step, the powders obtained from the 3rd step are cold-isostatically pressed. The parameters can be used as below. The pressure is between 100 MPa and 500 MPa.
In the 5^th step, the body obtained from the 4th step is sintered. The parameters can be used as below. The sintering temperature is between 600°C and 800°C, and the sintering time is between 5 hours and 9 hours.
In the 6^th step, the sintered body is hot-pressed. The parameters can be used as below. The hot pressing temperature is between 500°C and 800°C, the hot pressing pressure is between 300MPa and 700MPa, and the hot pressing time is between 1 min and 20 min.
In the 7^th step, the hot-pressed body is hot-extruded, thereby obtaining the fibrous structural silver-based electrical contact material. The parameters can be used as below. The heating temperature of the body is between 600°C and 900°C, the extruding ratio is between 100 and 400, the extruding speed is between 5 cm/min and 20 cm/min, and the preheating temperature of the extrusion mold is between 300°C and 500°C.
The detailed technical operations of the present invention are described with the following specifically applied embodiments.

Embodiment 1

Combined with the drawing, take the preparation of AgSnO₂(10) contact material as an example

Step 1: 300g reinforcing phase SnO₂ powders (with an average particle size of 5nm) are dissolved in 10L aqueous solution containing 800g hydrazine hydrate, and then the mixed solution is added into 15L aqueous solution containing 1200g AgNO₃ with a stirring speed of 120rev/min, and simultaneously ammonia is added to adjust the PH value of the solution to be 8 with the reaction time of 10 hours, the sediment is filtered out, washed and dried at the drying temperature of 100°C for 5 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 800°C and the sintering time is 2 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 10% of SnO₂ to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 30rev/min and the time is 4 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 100MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 800°C, and the sintering time is 5 hours.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 800°C, the hot pressing pressure is 500MPa, and the hot pressing time is 10min.
Step 7: The hot-pressed body is hot-extruded. The hot extruding temperature is 900°C, the extruding ratio is 225, the extruding speed is 5cm/min, and the preheating temperature of the extrusion mold is 500°C.

In this embodiment, the AgSnO₂(10) material with obvious SnO₂ fibrous reinforcing structure is finally obtained. The SnO₂ fibrous tissue structure is formed by directionally arranging and connecting many small SnO₂ nano-particles. Its metallographic photograph is shown in the drawing. The obtained material has the tensile strength of 280MPa, the resistivity along the extrusion direction of 2.1µΩ·m and the hardness of 83HV.

Embodiment 2

Take the preparation of AgZnO(8) contact material for example

Step 1: 300g reinforcing phase ZnO powders (with an average particle size of 500nm) are dissolved in 5L aqueous solution containing 60g hydrazine hydrate, and then the mixed solution is added into 10L aqueous solution containing 150g AgNO₃ with a stirring speed of 100rev/min, and simultaneously ammonia to adjust the PH value of the solution to be 10 with the reaction time of 5 hours, the sediment is filtered out, washed and dried at the drying temperature of 80°C for 6 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 600°C and the sintering time is 4 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 8% of ZnO to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 30rev/min and the time is 3 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 100MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 600°C, and the sintering time is 8 hours.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 800°C, the hot pressing pressure is 700MPa, and the hot pressing time is 1min.
Step 7: The hot-pressed body is hot-extruded. The hot extruding temperature is 600°C, the extruding ratio is 324, the extruding speed is 8cm/min, and the preheating temperature of the extrusion mold is 300°C.

In this embodiment, the AgZnO(8) material with obvious ZnO fibrous reinforcing structure is finally obtained. The ZnO fibrous tissue structure is formed by directionally arranging and connecting many small ZnO nano-particles. The obtained material has the tensile strength of 288MPa, the resistivity along the extrusion direction of 2.0µΩ·m and the hardness of 85HV.

Embodiment 3

Take the preparation of AgCdO12 contact material for example

Step 1: 300g reinforcing phase CdO powders (with an average particle size of 100nm) are dissolved in 5L aqueous solution containing 30g hydrazine hydrate, and then the mixed solution is added into 15L aqueous solution containing 90g AgNO₃ with a stirring speed of 80rev/min, and simultaneously ammonia is added to adjust the PH value of the solution to be 9 with the reaction time of 3 hours, the sediment is filtered out, washed and dried at the drying temperature of 40°C for 10 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 400°C and the sintering time is 6 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 12% of CdO to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 30rev/min and the time is 4 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 300MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 750°C, and the sintering time is 9 hours.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 800°C, the hot pressing pressure is 700MPa, and the hot pressing time is 20min.
Step 7: The hot-pressed body is hot-extruded to be sheet. The hot extruding temperature is 800°C, the extruding ratio is 100, the extruding speed is 20cm/min, and the preheating temperature of the extrusion mold is 300°C.

In this embodiment, the AgCdO12 material with obvious CdO fibrous reinforcing structure is finally obtained. The CdO fibrous tissue structure is formed by directionally arranging and connecting many small CdO particles. The obtained material has the tensile strength of 285MPa, the resistivity along the extrusion direction of 2.0µΩ·m and the hardness of 88HV.

Embodiment 4

Take the preparation of Ag-4ZnO-8SnO₂ contact material for example

Step 1: 300g reinforcing phase ZnO-SnO₂ powders (with a weight ratio of ZnO to SnO₂ in the ZnO-SnO₂ material being 0.5 and an average particle size of 300nm) are dissolved in 8L aqueous solution containing 400g hydrazine hydrate, and then the mixed solution is added into 12L aqueous solution containing 1200g AgNO₃ with a stirring speed of 80rev/min, and simultaneously ammonia is added to adjust the PH value of the solution to be 9 with the reaction time of 8 hours, the sediment is filtered out, washed and dried at the drying temperature of 80°C for 3 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 800°C and the sintering time is 2 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 12% of ZnO-SnO₂ to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 20rev/min and the time is 4 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 500MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 800°C, and the sintering time is 5 hours.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 800°C, the hot pressing pressure is 700MPa, and the hot pressing time is 10min.
Step 7: The hot-pressed body is hot-extruded. The hot extruding temperature is 900°C, the extruding ratio is 400, the extruding speed is 5cm/min, and the preheating temperature of the extrusion mold is 500°C.

In this embodiment, the Ag-4ZnO-8SnO₂ material with obvious ZnO and SnO₂ fibrous reinforcing structures is finally obtained. The ZnO and SnO₂ fibrous tissue structure are respectively formed by directionally arranging and connecting many small ZnO and SnO₂ nano-particles. The obtained material has the tensile strength of 255MPa, the resistivity along the extrusion direction of 2.3µΩ·m and the hardness of 89HV.

Embodiment 5

Take the preparation of AgNi(25) contact material for example

Step 1: 300g reinforcing phase Ni powders (with an average particle size of 30µm) are dissolved in 8L aqueous solution containing 280g hydrazine hydrate, and then the mixed solution is added into 12L aqueous solution containing 800g AgNO₃ with a stirring speed of 90rev/min, and simultaneously ammonia is added to adjust the PH value of the solution to be 11 with the reaction time of 3 hours, the sediment is filtered out, washed and dried at the drying temperature of 40°C for 8 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 700°C and the sintering time is 4 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 25% of Ni to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 30rev/min and the time is 2 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 200MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 600°C, and the sintering time is 7 hours.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 500°C, the hot pressing pressure is 500MPa, and the hot pressing time is 20min.
Step 7: The hot-pressed body is hot-extruded to be sheet. The hot extruding temperature is 800°C, the extruding ratio is 225, the extruding speed is 10cm/min, and the preheating temperature of the extrusion mold is 500°C.

In this embodiment, the AgNi(25) material with obvious Ni fibrous reinforcing structure is finally obtained. The Ni fibrous tissue structure is formed by directionally arranging and connecting many small Ni particles. The obtained material has the tensile strength of 295MPa, the resistivity along the extrusion direction of 1.95µΩ·m and the hardness of 80HV.

Embodiment 6

Take the preparation of AgFe7 contact material for example

Step 1: 300g reinforcing phase Fe powders (with an average particle size of 5µm) are dissolved in 5L aqueous solution containing 350g hydrazine hydrate, and then the mixed solution is added into 15L aqueous solution containing 1000g AgNO₃ with a stirring speed of 120rev/min, and simultaneously ammonia is added to adjust the PH value of the solution to be 8 with the reaction time of 10 hours, the sediment is filtered out, washed and dried at the drying temperature of 100°C for 8 hours, thereby obtaining the composite powders with Ag coating the reinforcing phase.
Step 2: The composite powders obtained from the 1st step are granulated. The parameters can be used as below. The sintering temperature is 700°C and the sintering time is 2 hours.
Step 3: The composite powders obtained from the 2nd step are weighed, and the matrix silver powders are added into the composite powders according to the weight ratio 7% of Fe to the total weight, and then placed into the "V"-shaped powder mixer for evenly mixing. While mixing, the speed is 25rev/min and the time is 2 hours.
Step 4: The powders obtained from the 3rd step are placed into a plastic tube with a diameter of 90cm and a length of 150cm for cold-isostatically pressing. The cold isostatic pressure is 500MPa.
Step 5: The cold-isostatically pressed body obtained from the 4th step is sintered. The sintering temperature is 600°C, and the sintering time is 5 hours at the protection of H₂.
Step 6: The sintered body obtained from the 5th step is hot-pressed. The hot pressing temperature is 800°C, the hot pressing pressure is 300MPa, and the hot pressing time is 20min.
Step 7: The hot-pressed body is hot-extruded to be sheet. The hot extruding temperature is 700°C, the extruding ratio is 200, the extruding speed is 10cm/min, and the preheating temperature of the extrusion mold is 400°C.

In this embodiment, the AgFe7 material with obvious Fe fibrous reinforcing structure is finally obtained. The Fe fibrous tissue structure is formed by directionally arranging and connecting many small Fe nano-particles. The obtained material has the tensile strength of 320MPa, the resistivity along the extrusion direction of 1.85µΩ·m and the hardness of 79HV.

Claims

A method of preparing a silver-based electrical contact material with directionally arranged reinforcing particles comprising steps of:
(A) dissolving reinforcing powder in a hydrazine hydrate solution, adding the mixed solution into AgNO₃ solution for stirring, simultaneously adding ammonia for adjusting a pH value of the solution, filtering out precipitation following the reaction, and washing and drying the filtered precipitation, thereby obtaining a composite powder with Ag coating on the reinforcing particles, wherein a weight ratio of the reinforcing phase to AgNO₃ is calculated according to a content of these materials, and a weight ratio of the hydrazine hydrate to AgNO₃ is calculated according to the amount of Ag ions to be reduced by the hydrazine hydrate;

(B) sintering and granulating the composite powder obtained from the step (A);

(C) mixing the powder obtained from the step (B) and a matrix silver powder in a powder mixer, wherein a weight ratio of the composite powder to the matrix silver powder is calculated according to the amount of both starting materials;

(D) cold-isostatically pressing the powders obtained from the step (C);

(E) sintering the cold-isostatically pressed body;

(F) hot-pressing the sintered body; and

(G) hot-extruding the hot-pressed body, thereby obtaining the silver-based electrical contract material with directionally arranged reinforcing particles.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (A), a weight ratio of the reinforcing powder to AgNO₃ is 1/4-10/3; a weight ratio of the hydrazine hydrate to AgNO₃ is 2/3-1/3; a stirring speed is 80 rev/min-120 rev/min; an adjusted pH value after adding ammonia is 8-11; a reaction time is 3-10 hours; a drying temperature is 40-100°C; and a drying time is 5-10 hours.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (A), the reinforcing particles are a kind of material or a mixture of a variety of materials.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (B), a sintering temperature is 400-800°C, and a sintering time is 2-6 hours.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (C), a speed of the powder mixer is 20 -30 rev/min, and a mixing time is 2-4 hours.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (D), a cold isostatic pressure is 100-500 MPa.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (E), a sintering temperature is 600-800°C, and a sintering time is 5-9 hours.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (F), a hot-pressing temperature is 500-800°C, a hot-pressing pressure is 300-700 MPa, and a hot-pressing time is 1-20 min.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles according to claim 1, wherein in the step (G), a heating temperature of the body is 600-900°C, the extruding ratio is 100-400, the extruding speed is 5-20 cm/min, and the pre-heating temperature of the extrusion mold is 300-500°C.
The method of preparing the silver-based electrical contract material with directionally arranged reinforcing particles, according to claim 3, wherein for the silver-based electrical contract material with directionally arranged reinforcing particles, the reinforcing phase exists in the matrix in a form of particles being connected with each other and being directionally arranged, an average size of the reinforcing particles is 5 nm-30 µm.